FINLAND
New waste-water products from Evac F
OR many years, Evac Marine, today part of the Zodiac Group, has been known as a designer and manufacturer of vacuum-based waste-water collecting and treatment systems for the shipbuilding industry. In 2004/2005 net sales were €35 million, and some 8300 ships are currently in the reference list; the company claims it has a 90%-plus market share among cruise ships.
Some 900,000 Evac vacuum toilets are in operation worldwide but, according to the company, only some 45% of ships built annually have vacuum toilet systems, since vessels ordered in low-labour-cost countries tend to have gravity systems installed, which are considered more economic. Vacuum systems are installed only if specified by the owner. Now, Evac wants to penetrate this sector of the market (which consists mainly of cargo ships), claiming that competition and technical development have shrunk vacuum system costs, in addition to those savings gained from cheaper installation costs. The company has therefore developed a new toilet, the Evac Classic, specifically for cargo ships.
In order to save costs, the number of parts has been reduced by half, compared with other models. This has been achieved through integrating components and through a simplified working action. With these changes, Evac claims it now has a competitive new product for both yards and shipowners, and in 2006-2007, the company aims to secure orders to fit the new product in some 60-70 new vessels.
Entering the waste-water treatment market Recently, Evac has also entered the waste- water treatment sector. Before deciding on which technique to employ, several alternatives were examined, after which a flat-sheet submerged membrane bio-reactor process was selected. Evac's membrane bio- reactor can process both black and grey water together, or alternatively, on large ships, only black water, also galley and food waste waters, since it is more economical to treat grey water separately on large vessels. The Evac MBR, a single-stream system, is designed for all types of waste water and can be delivered on a common skid with its vacuum components. In the alternative dual- stream Zebra system, the membrane bio- reactor is used for treating concentrated galley waste and black waters. Grey water from cabins and laundry water are treated in a separate electro-coagulation unit. In the Zebra product range, the treatment process plant is custom-designed, combining standard equipment of optimal capacities. Evac's MBR products are IMO MARPOL- certified. A pilot installation of the MBR type, treating both grey and black water, has been operating successfully on Finnlines' ro-pax ferry Finnclipper for more than a year. The
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Evac's MBR membrane bio-reactor single-stream system can handle all types of waste water. Standard units are produced for all ship sizes.
In the Zebra dual-stream process, the membrane bio-reactor treats concentrated galley waste and black water. Grey water from cabins and laundries is treated in a separate electro-coagulation unit.
) has been less than 3mg/litre and total suspended solids (TSS) less than 5mg/litre, ie, below the minimum scale of measurement. No coliform bacteria have been measured in the treated water. These measurements have shown that the level of treatment secures a carefree disposal of treated effluent.
quality of the cleaned water is said to have been excellent, with less than 1% of organic materials and particles measured in all samples taken. Biological oxygen demand (BOD5
Advanced waste-water treatment plants are currently installed on cruise ships, naval vessels, superyachts, and specialised vessels and rigs operating in environment-sensitive areas. Evac estimates that the market will grow relatively rapidly due to environmental awareness and governmental actions, as well as tightened regulations on waste water generally. This year, Evac estimates to sell and install between four and six of its advanced treatment plants, and in 2007, to double that figure, at least.
THE NAVALARCHITECT FEBRUARY 2006
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